FI85358B - MASKIN FOER TILLVERKNING AV PAOSAR MED TEFYLLDA DUBBELFACK. - Google Patents

Abstract

In this machine, a continuously moving tubular web is cut to form tubular pieces of equal size which in each case contain two portions of tea, these pieces being passed with the aid of a continuously rotating transport wheel 10 to various work stations in which first of all the bag bottom is formed and then the tubular piece 15, folded in a W shape by drawing the bag bottom into the interior of the transport wheel, is sealed by folding the head to give a double-chamber bag, there extending at the level of the circumferential plane of the transport wheel 10 a cover 20 which, together with a pair of arms 21, 22 fastened pivotably on the transport wheel, ensures precise fixing and positioning of the tubular piece during the entire production process, and at the same time the open ends of the tubular piece are bound in such a manner that the tea is at no time able to scatter into the tabs 15c, 15d provided for forming the head fold (Fig. 2). <IMAGE>

Description

1 85358

Machine for producing double-compartment bags filled with tea. - Maskin för tillverkning av päsar med tefyllda dubbel-fack

The invention relates to a machine for producing tea-filled double-compartment bags from a continuous web of tubular material, according to the preamble of claim 1.

German patent 1,001,944 describes a machine of the type mentioned at the beginning, in which the bags are formed and closed only by folding. The transport wheel with the cut pipe piece passes through the process through various work points where the bottom of the bag, and after the pipe pieces have been lifted, the top edge closures are made. The progressive performance of the individual work steps causes a certain irregularity in the production order, so that there is a risk, especially in the case of tea packaged as a free-flowing bag, that the tea portions will not remain precisely in place during production. Even a small spill or spread of tea portions can significantly impede the folding of the bags if the tea enters the area of the tube pieces arranged for the bottom fold and / or the top fold. The occurrence of vibrations and shocks thus has a particularly detrimental effect in the production space after the pipe piece has been cut off from the pipe web, until the W-shaped folded parts of the pipe piece are closed.

As the demand situation in principle justifies an increase in production capacity, it has already been suggested on several occasions that separate production units for a continuously rotating means of transport be arranged in a bag-type double-compartment machine (cf. in particular German patents 2,120,270 and 2,405,761). In these known machines, although the bag web is held in place in the area of the bottom of the next bag before the individual portions are cut, the 2 85358 portions containing tea portions remain essentially unsecured until the top edge is formed, so that especially when the bag portions are lifted by the arms. difficulty in forming the fold. In addition, the continuous use of the means of transport regularly results in higher rotational speeds and thus correspondingly higher centrifugal forces, which further increase the risk of spreading.

It is therefore an object of the present invention to further develop the machine defined in the introduction in an advantageous manner so as to achieve higher working speeds and a reduction in problem sensitivity, in particular by forming folds at the bottom and top.

In a machine of the type mentioned at the beginning, this object is achieved by the features of claim 1.

The interaction of the fixed cover and the bearing surfaces of the arms ensures reliable fastening and accurate placement of the pipe pieces immediately after they have been transferred to the transport wheel, throughout the production process. The spread of tea is thus largely avoided even in extreme conditions. In addition, the precise positioning of the pipe pieces guarantees high dimensional accuracy when the W-shaped base fold is formed and when the parts of the pipe pieces are then placed opposite each other, during which operation the bottom of the bag is pulled inside the transport wheel. In this way, both the centrifugal forces acting on the tea and the inertia forces acting on the transport wheel are reduced, which has a very beneficial effect on its smooth running and also helps to reduce unwanted vibrations in this critical production area.

According to a preferred embodiment of the invention, wherein the bearing surfaces of the arms are in constant contact with the underside of the lid, and wherein the pipe pieces are suitably fastened, at least one arm is arranged on a sliding body having position I; 3 Within the framework of 85358 sliding steering, it can be changed with a rocker arm articulated at one end to the arm and at the other end to the transport wheel.

According to another embodiment of the invention, to ensure even better lateral attachment of the pipe body parts without damaging the pipe material during bag completion, the bearing surface of the arms and the underside of the cover are connected by at least one longitudinal, groove-like and spring-like connection with a small gap on each side.

In order to avoid substantial relative movement between the web and the cutter when cutting pipe pieces from the tubular web, the cutter device preferably comprises a cutter arm rotating at the speed of the tubular web and having at least one cutter blade and a plurality of cutter bars at equal angular distances to the transport wheel.

According to a preferred embodiment of the invention, the cutter arm is arranged in the direction of travel of the tubular web in front of the upper part of the transport wheel, its lowest point being slightly below the upper part of the transport wheel so that the cut pipe piece remains in the entry plane as close to side time as possible.

According to another preferred embodiment of the invention, the cutter blade of the cutter arm has at least one notch, so that the pipe piece is not yet completely cut off from the pipe web, whereby the final separation takes place only after the base folding station has received and secured the pipe piece.

In order to further secure the pipe piece to the base folding station, and at the same time to press the base fold deep enough into the profiled part without damaging the filter paper, the holding means preferably comprises two folding blades fixedly spaced 4,835,351a apart. the notch interacts with the top of the profiled part.

Due to the continuous rotation of the transport wheel and the high speeds at which it can thus be achieved, it is advantageous according to a preferred embodiment of the invention to provide a matrix with an approach edge for lugs arranged to form an upper edge fold of parts of the pipe piece. to a height of the circumference of the transport wheel, which matrix is substantially parallel to the axis of rotation of the transport wheel, and the matrix has a recess which tapers evenly inwards, the dimensions of which substantially correspond to the top of the bag and which cooperates with a correspondingly shaped slide mainly to be moved in the circumferential plane of the transport wheel, and which presses the lugs extending beyond the surface of the recess against the outer surface of the matrix remote from the transport wheel, the folding tongue simultaneously p groove through the lugs in the region of the recess on the inner surface of the matrix.

In this arrangement, the matrix on the opposite side of the inlet edge may preferably have a folding edge running parallel to the approach edge and interacting with the turning means to turn the top edge of the bag.

In order to iron the top edge of the bag after turning and at the same time provide a sharp fold, it may be advantageous, according to another preferred embodiment of the invention, for the turning means to interact with the tongue pulling the upper edge fold around the approaching edge of the turning means and pressing it against the latter.

An exemplary embodiment of the invention will now be described in more detail with reference to the accompanying drawings, in which: 5 85358

Figure 1 shows a diagram of the various working points through which the transport wheel of the machine according to the invention passes when rotating clockwise;

Fig. 2 shows the separate production units of the workstations according to Fig. 1 in a schematic order;

Fig. 3 shows a schematic diagram of a cutting device with a pair of traction wheels arranged on the upstream side according to Fig. 2;

Fig. 4 shows a work station according to station C in Fig. 2;

Fig. 5 shows a section along the line I-I in Fig. 4; and

Figures 6-10 show other work stations according to stations D, E, G and H in Figure 2.

According to Figure 1, during the production of the bags, the transport wheel 10 according to the invention passes continuously through the following functional zones: I. Cutting of pipe sections from the tubular web; II. Fastening of pipe pieces transferred to the transport wheel; III. Closing W-shaped folded pipe sections with a top closure; and IV. Squeezing and lifting the top edge in preparation for this next stapling.

As can be seen in particular from Figure 2, the operating zone I mainly comprises a pair of traction wheels 11 which continuously feed a tube 13 made of material web and filled with 6 85358 tea portions 12 to a cutting device 14. The cutting device 14 cuts two pieces of tea 15 from the material web. The operating zone II, which is directly connected to the cutting device 14, essentially comprises a transport wheel 10, a fixed cover 20 on the transport wheel 10, a plurality of pairs of arms 21, 22 for holding and securing pipe pieces 15, and a device for forming a bottom fold with a plurality of profiled parts 23 and holding means 24 cooperating therewith 24. The next operating zone III forms an upper edge folding station in which the upper edge closure is produced by means of a matrix 50 and a slider 51. Finally, there will be an operating zone IV, which e.g. is provided with two pressure flaps 60 and 61 for pressing and lifting the top edge fold. Not all machine units and other parts located outside said operating zones are relevant to the invention and will therefore not be described in more detail.

The cutter device 14, shown on a larger scale in Figure 3 and having a pair of drive wheels 11 arranged upstream, has a cutter arm 16 with at least one cutter blade 17 which interacts with a cutter bar 18 arranged at equal angular distances between two successive pairs of arms 21, 22 and fixedly attached to the carriage 10. The cutter arm 16 is continuously driven at the speed of the tube web and arranged in the direction of travel of the tube 13 in front of the carriage 10 at a height such that its lowest point is slightly below the carriage 10. The cutter blade 17 of the cutter arm 16 has at least one, but preferably two, spaced notches (not shown), the operation of which will be explained later.

According to Figure 4, the cover 20 extending immediately into the cutter device 14 is preferably designed in the form of a rail in the present invention. It extends over the entire operating zone li 7 85358 II / whereby the undersides 25 of the rails 26 are at the same height as the circumferential plane of the transport wheel 10. The distance between the rails 26 preferably corresponds to about one third of the width of the tubular web. The free end of the arms 21, 22 has a bearing surface 27 for cutting and holding the pipe pieces 15. The arms 21, 22 are movably attached to each other and are guided by an articulated system such that the bearing surface 27 is in continuous contact with the undersides 25 of the rails 26. The articulated system comprises a rocker arm 28 (Fig. 2) articulated at one end to the arms 21, 22. at point 30, a transport wheel 10 is provided, as well as a slide piece 32 with a sliding guide 31 fixed to the transport wheel 10, to which the arms 21, 22 are rotatably fixed.

The profiled part 23 of the bottom folding device is located centrally between each pair of arms 21, 22, the profiled part 23 being reciprocatable within the transport wheel 10 substantially radially between the initial position (Fig. 2, position B) and the end station (Fig. 2, position F), and having flexible side portions 34 on either side of the wedge-shaped central portion 33. In its initial position, the upper edge of the profiled part 23 terminates in the inlet plane parallel to the lateral time of the pipe piece 15. The holding means 24, which interacts with the profiled part 23, comprises two folding blades 35 which are fixedly connected to each other at a distance and between which a folding plate 37 is mounted, which is acted upon by a spring 36 (Fig. 2). The surface of the lower end of the folding plate 37 is provided with a notch 38 which, in the operating position of the base folding means, interacts with the central part 33 of the profiled part 23. The holding means 24, which can be controlled from the outside, performs an inwardly oscillating and an outwardly oscillating movement, and in its lower part there are slots into which the rails 26 of the cover 20 extend when it is in the working position. The pipe section portions 15a, 15b located on both sides of the profiled portion 23 are gripped from the end region outside the tea portions 12 and pressed against the underside 25 of the lid 20 by the arms 21, 22 so that lugs 15c and 15d of different lengths remain free. for forming the fold in a manner known per se.

In the present embodiment, the undersides 25 of the rails 26 are designed to be wedge-shaped and extend into respective notches 39 formed in the bearing surfaces 27 of the arms 21, 22 (Fig. 5). But in order to fasten and join the pipe pieces, it may also be advantageous to form the undersides of the rails 26 so as to have a straight surface, which undersides then extend into correspondingly shaped grooves in the bearing surfaces of the arms. In order not to damage the pipe material in contact, it is always advantageous to leave a small gap between the groove and the contacting sides of the spring joint.

Towards the end of the operating zone II, the cover 20 has a stepped portion 40 (Figures 2, 6 and 7) so that the undersides 25 of the rails 26 are slightly rearward in a relatively small angular range with respect to the plane of movement of the arms 21, 22 so as to end directly on the surface 41, which is substantially parallel to the circumferential plane of the drive wheel 10.

As can be seen in particular from Figure 7, the steel tongue 42 is preferably guided on the outer surface of the arm 21, whereby the tongue 42 can be moved longitudinally against the force of the spring 44 by means of a pull lever 43 from the initial position of the free end of the tongue 42 to the upper edge the free end of the tongue 42 extends through the bearing surface 27. The movement of the towing lever 43 connected to the arm 21 by the pivot shaft 47 is controlled by a cam plate 45 over which a wheel 46 attached to the towing lever passes. At the level of the stepped portion 40 there is a lever 48 pivotally arranged above the cover. in an area where the head 49 extends as close as possible to the trajectory of the arms 21, 22 at the highest point of the curved portion, without, however, touching their support surfaces 27.

9 85358

As shown in Figures 2, 8 and 9, the matrix 50 arranged as an extension of the cover 20 and the slider 51 of the upper folding station, like the lower surfaces 25 of the rails 26, are substantially parallel to the circumferential plane lateral time of the drive wheel 10. The matrix 50, which can move up and down substantially along the lateral plane, has an approach edge 52 facing upwards against the direction of rotation of the transport wheel 10, for ears 15c, 15d of pipe body portions 15a, 15b arranged to form the top edge fold, and on the opposite side thereof. is a fold edge 53 over which the top edge of the bag is turned. Both edges 52, 53 are substantially parallel to the axis of rotation of the transport wheel 10. The approach edge 52 is provided with a recess 54 having uniformly inwardly sloping side surfaces, the shape and dimensions of which correspond to the top edge of the bag when the side fold is formed. The slide 51, which is located slightly behind the matrix 50, comprises a rigid cover plate 55 and a folding tongue 56 parallel thereto, is made of spring steel with a width corresponding to the width of the pipe piece 15, and its end is formed so as to be trapezoidal in shape. in the direction of rotation so that it can pass past the recess 54. For this purpose, the slide 51 performs a movement which, in the direction of rotation of the transport wheel 10, in particular approximately laterally parallel to the initial position and then substantially parallel to the trajectory of the arms 21, 22 down to the end position. At the end position of the slider 51, the inner surface 55 of the cover plate 55 contacts the outer surface of the matrix 50 and the outer surface of the folding tongue 56 contacts the inner surface of the matrix 50 (Figure 8).

Arranged in the side-time plane extension of the matrix is a pivot line 57 in the form of a flat steel bar having an operating edge 58 parallel to the folding edge 53, allowing it to move from a starting position on the lateral plane (Fig. 8) to a terminal on the outer surface in the region touches the edge region 53 of the fold edge of the matrix 50 (Fig. 10). At this end position, the flexible tongue 59, which is guided in step with the movement in the direction of the side time 10 8 5 358 of the matrix 50, has an operating edge 58 against the edge region.

The compression flaps 60, 61 are arranged after the operating zone III and are an integral part of the work station where the upper edge of the bag, approximately parallel to the lateral direction of travel of the transport wheel 10, is made for the next stapling. The compression flap 60, which is driven counterclockwise outside the transport wheel 10 by means of a shaft, has an operating surface 63 which is substantially parallel to the lateral time and which, in its circular path, laterally travels the path of movement of the arms 21, 22. The pressure flap 61 is pivotally articulated to the pressure flap 60 and is guided by a cam plate (not shown) so that its operating surface 64 at the top of both circular paths contacts the operating surface 63 of the pressure flap 60.

The operation of the separate units shown in Figures 3-10 of the machine according to the invention will be explained below in accordance with steps A to I of Figure 2.

The tube 13 continuously fed to the transport wheel 10 remains in its substantially horizontal inlet plane until the tube web has reached the position shown in point B, where the arms 21, 22 pivot in and hold in place and secure the tube piece 15 between the cover 20 and the transport wheel 10. The pipe piece fastened in this way is then cut off from the put web, with the exception of two small connecting bridges, by the cutting device 14 in position A.

When position C is reached, the tubular body 15 is gripped centrally between the two tea portions 12 by the retracted downwarding means 24 and pressed into the profiled portion 23 to form a W-shaped bottom fold held in place by the flexible side portions 34 of the profiled portion 23. To form a bottom fold , 22 simultaneously begin their inward closing movement, which at this point results in complete tearing of the pipe piece from the n 85358 tubular web. When the holding means 24 returns to its initial position, the profiled part 23 moves radially downwards inside the transport wheel 10 and pulls the bottom fold with it until the end position is reached at D. During this process, the closing movement of the arms 21, 22, which starts simultaneously, at a pace until the arms 21, 22 have reached their final closing position shortly before reaching the stepped portion of the lid 20, in which the two raised portions 15a, 15b of the tube piece are pressed together over the tea portions 12, thus remaining closed and engaged until the top closure is completed.

After the arms 21, 22 have passed the stepped portion 40 of the lid 20 and the lugs 15c, 15d of the raised portions 15a, 15b of the pipe body have lost contact with the underside of the lid 20, the shorter tab 15c below is momentarily lifted by the upwardly moving tongue 42 on the retractable lever 48 49, and that it can be turned in the direction of travel (position E in Fig. 7). The lugs 15c, 15d are then pressed outwardly on the rear surface 41 of the cover 20 in the direction of travel so that as they continue to pass, they strike the approach edge 52 of the top-fold folding station matrix 50, where they are received in the recess 54 (position F). At the same time, the slider 51 performs its folding movement, during which the folding tongue 56 crosses the trajectory of the matrix 50 and the cover plate 55 fixedly locks the ear areas not pressed through to provide a sharp folding edge when folding the sides (position G). Continuing along the inner side of the matrix 50, the upper edge of the laterally folded lugs is folded, after passing the fold edge 53 of the matrix 50, outwardly by the folding movement of the pivot means 57, and tightened with a tongue 59 (position H or Fig. 10).

12 85358 After leaving the top folding position, the top edge of the bag at an acute angle to the radial plane is raised again and at the same time pressed with both clamping flaps 60, 61 so that the closure staples can be reliably fastened in the next step (not shown).

Claims (10)

A machine for making double-compartment tea-filled bags from a web of material formed as a continuous tube, on which the tea is set at evenly spaced portions, the machine comprising a cutting device for cutting a two-portion tube piece, a transport wheel receiving a cut tube piece and having a rotary arranged arms arranged in pairs at equal angular distances and movably connected to each other, gripping the pipe piece close to its ends and holding parts of the pipe piece in a closed position, a device for forming a base fold, the device comprising a W-shaped profile, arranged for each pair of arms on a transport wheel a holding means which interacts with this W-shaped profile and grips the tube body substantially between the two doses and presses it into the profile, and a device p for closing the W-shaped folded parts of the mouthpiece, characterized in that the transport wheel (10) rotates continuously in a manner known per se and that a fixed cover (20) is arranged in the region of its uppermost point extending substantially in the circumferential plane of the transport wheel (10) at the height that the free ends of the arms (21, 22), at the end faces, have a bearing surface (27) which receives the pipe piece (15) after cutting and presses it against the underside of the lid (20) and that the W-shaped profile is a separate profiled part ( 23), the outer arms of which are formed as flexible side portions (34) which hold the bottom fold in place after it has been removed by the holding means (24) and which, depending on the bottom fold, can be lowered into the transport wheel (10) by arms (21, 22). ) at the pace of the closing movement. Machine according to Claim 1, characterized in that at least one arm (21, 22) is arranged on a sliding body (32), the position of which within the sliding guide (31) can be changed by means of a rocker arm (28) at one end 5358 dassa 29) is articulated to the arm (21, 22) and at one end (at 30) to the transport wheel (10). Machine according to Claim 1 or 2, characterized in that the bearing surface (27) of the arms (21, 22) and the underside (25) of the cover (20) are connected by at least one longitudinal, groove-like and spring-like connection, each side of the contacting sides there is a slight gap. Machine according to one of Claims 1 to 3, characterized in that the cutting device (14) comprises a cutting arm (16) which rotates at the speed of the tube (13) and has at least one cutting blade (17) and a plurality of cutting bars ( 18) arranged at equal angular distances to the transport wheel (10). Machine according to Claim 4, characterized in that the cutter arm (16) is arranged in the direction of travel of the pipe (13) in front of the upper point of the transport wheel (10), its lowest point being slightly below the upper point of the transport wheel (10). Machine according to Claim 4 or 5, characterized in that the cutter blade (17) of the cutter arm (16) has at least one notch. Machine according to one of Claims 1 to 6, characterized in that the holding means (24) comprises two folding blades (35) which are fixedly connected to one another at a distance and between which a spring-operated folding plate (37) is arranged, the notch on the lower end surface ( 38) interacts with the central part (33) of the profiled part (23). Machine according to one of Claims 1 to 7, characterized in that a matrix (50) is provided with an approach edge (52) for lugs (15c, 15d) arranged to form a fold at the top of the pipe body parts (15a). 15b), which matrix is arranged after the cover (20) at a circumferential height of the transport wheel (10), and which matrix (50) is substantially parallel to the axis of rotation of the transport wheel (10), and the matrix has a recess (54) which tapers evenly inwardly and having dimensions substantially corresponding to the top of the bag and cooperating with a folding tongue (56) of a correspondingly shaped slide (51) arranged to be reciprocated substantially in the circumferential plane of the transport wheel and pressing the lugs extending beyond the surface of the recess into the matrix (50) against the outer surface of the wheel (10), the folding tongue (56) being simultaneously Puri passing the lugs (15c, 15d) in the region of the recess (54) onto the inner surface of the matrix (50) facing the transport wheel (10). Machine according to claim 8, characterized in that the matrix (50) on the opposite side of the inlet edge (52) preferably has a folding edge (53) running parallel to the approach edge (52) and interacting with the turning means (57) to turn the top edge of the bag with. Machine according to claim 9, characterized in that the turning means (57) interacts with a tongue (59) which pulls the upper edge fold around the approaching edge (58) of the upper turning means (57) and presses it against the outer surface of the latter. 16 85358